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Finding the Fourth Proportional to 138,419.40, 207,629.10 and 68,435.40

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Solution

The fourth proportional to 138,419.40, 207,629.10 and 68,435.40 is: 102,653.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,419.40 : 207,629.10 = 68,435.40 : x
  2. Step 2: Convert to fraction form
    138,419.40/207,629.10 = 68,435.40/x
  3. Step 3: Cross multiply
    138,419.40x = 207,629.10 × 68,435.40
  4. Step 4: Simplify right side
    138,419.40x = 14,209,180,510.14
  5. Step 5: Solve for x
    x = 14,209,180,510.14/138,419.40
  6. Step 6: Final answer
    x = 102,653.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.